# Copyright 2019 The Magenta Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Tests for events_lib."""

import copy

from magenta.music import events_lib
import tensorflow as tf


class EventsLibTest(tf.test.TestCase):

  def testDeepcopy(self):
    events = events_lib.SimpleEventSequence(
        pad_event=0, events=[0, 1, 2], start_step=0, steps_per_quarter=4,
        steps_per_bar=8)
    events_copy = copy.deepcopy(events)
    self.assertEqual(events, events_copy)

    events.set_length(2)
    self.assertNotEqual(events, events_copy)

  def testAppendEvent(self):
    events = events_lib.SimpleEventSequence(pad_event=0)

    events.append(7)
    self.assertListEqual([7], list(events))
    self.assertEqual(0, events.start_step)
    self.assertEqual(1, events.end_step)

    events.append('cheese')
    self.assertListEqual([7, 'cheese'], list(events))
    self.assertEqual(0, events.start_step)
    self.assertEqual(2, events.end_step)

  def testSetLength(self):
    events = events_lib.SimpleEventSequence(
        pad_event=0, events=[60], start_step=9)
    events.set_length(5)
    self.assertListEqual([60, 0, 0, 0, 0],
                         list(events))
    self.assertEqual(9, events.start_step)
    self.assertEqual(14, events.end_step)
    self.assertListEqual([9, 10, 11, 12, 13], events.steps)

    events = events_lib.SimpleEventSequence(
        pad_event=0, events=[60], start_step=9)
    events.set_length(5, from_left=True)
    self.assertListEqual([0, 0, 0, 0, 60],
                         list(events))
    self.assertEqual(5, events.start_step)
    self.assertEqual(10, events.end_step)
    self.assertListEqual([5, 6, 7, 8, 9], events.steps)

    events = events_lib.SimpleEventSequence(pad_event=0, events=[60, 0, 0, 0])
    events.set_length(3)
    self.assertListEqual([60, 0, 0], list(events))
    self.assertEqual(0, events.start_step)
    self.assertEqual(3, events.end_step)
    self.assertListEqual([0, 1, 2], events.steps)

    events = events_lib.SimpleEventSequence(pad_event=0, events=[60, 0, 0, 0])
    events.set_length(3, from_left=True)
    self.assertListEqual([0, 0, 0], list(events))
    self.assertEqual(1, events.start_step)
    self.assertEqual(4, events.end_step)
    self.assertListEqual([1, 2, 3], events.steps)

  def testIncreaseResolution(self):
    events = events_lib.SimpleEventSequence(pad_event=0, events=[1, 0, 1, 0],
                                            start_step=5, steps_per_bar=4,
                                            steps_per_quarter=1)
    events.increase_resolution(3, fill_event=None)
    self.assertListEqual([1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0], list(events))
    self.assertEqual(events.start_step, 15)
    self.assertEqual(events.steps_per_bar, 12)
    self.assertEqual(events.steps_per_quarter, 3)

    events = events_lib.SimpleEventSequence(pad_event=0, events=[1, 0, 1, 0])
    events.increase_resolution(2, fill_event=0)
    self.assertListEqual([1, 0, 0, 0, 1, 0, 0, 0], list(events))


if __name__ == '__main__':
  tf.test.main()
